Arsenic grinding building at New Consols Mine, circa 40m south-west of the row of calciners

The arsenic grinding building at New Consols Mine, located approximately 40 meters south-west of the row of calciners, dates from the late 19th century. It is constructed of stone rubble with brick detailing. Originally, the roof was made of slate, but it has since been re-roofed with corrugated sheeting.

The building has a rectangular plan and is two storeys high with a hipped roof. The west elevation features a ground floor doorway, a window with an intact frame, and another window on the second floor. The north elevation includes an additional doorway and three windows, one of which is splayed on the ground floor. The east elevation has a doorway on the second floor, while the south wall has a single doorway.

Inside, there is a stone central partition wall on the ground floor. The ceiling and beams have been removed, leaving the interior open to the roof. In the south-west corner, there is a horizontal wrought-iron steam boiler, which is surrounded by an outer brick casing. This boiler may be original and was likely used to dry arsenic before grinding. The roof timbers have been recently replaced with new rafters and battens.